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Construction to show that block design exists

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#combinatorics #geometric-construction #combinatorial-designs
125
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Resizing a matrix

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#combinatorics #matrices #number-theory #recreational-mathematics
6.7k
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How many $7$-digit numbers are there with non-repeating digits?

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#combinatorics #proof-writing #combinations
108
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$M \lambda=\mu \implies \lambda \geq \mu$, where $\lambda, \mu$ are partitions of $n$, and $M$ is a $n \times n$ double stochastic matrix

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#combinatorics #integer-partitions
72
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Easier solution for urn-problem

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#probability #combinatorics #stochastic-processes
155
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Solving n-tuple alphabet problem with recurrence relation

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#combinatorics #recurrence-relations
113
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Vandermonde-like identity mixing combination and permutation

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#combinatorics #summation #permutations
194
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Combinatorics Basics

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#combinatorics #combinations
512
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Number of subsets with a median of 6?

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#combinatorics #permutations #contest-math
38
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A combination calculation with a twist

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#combinatorics #permutations
176
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find amount all the 3-digit numbers

Published on
#combinatorics #combinations
234
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Using Pigeonhole principle to prove a subset statement

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#combinatorics #discrete-mathematics #pigeonhole-principle
120
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Sum involving powers of roots of unity

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#combinatorics #number-theory #roots-of-unity
41
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How many different one-to-one acquaintances does the company have?

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#combinatorics #graph-theory #computational-mathematics
1k
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2 people play a tennis match. Probability of winning?

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#probability #combinatorics #permutations

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